This is an interesting concept.Sometime last year I had a post about moonfolk, inspired by Japanese mythology. Weird people who come down from the moon in odd cages to kidnap damsels to put them in distress. Fun usually ensues.

So they emit the light of truth three days out out of the month, the light of falsehood for nearly half the month (between half and new is crescent).

Now here's a question for ya: what are they like for the three days when they're in the New phase? Do they collapse into a coma, headless, and ideally protected by non-lunary guards? Or do they turn into undead beacons of darkness? Or maybe they gain a 'full' face, but it emits darklight (makes whites really stand out) that forces all in its light to be mute?